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Is the effect of non-invasive ventilation on survival in amyotrophic lateral sclerosis age-dependent?

Arno Vuori; Waltteri Siirala; Riku Aantaa; Klaus T Olkkola; Tarja Saaresranta

Is the effect of non-invasive ventilation on survival in amyotrophic lateral sclerosis age-dependent?

Arno Vuori
Waltteri Siirala
Riku Aantaa
Klaus T Olkkola
Tarja Saaresranta
Katso/Avaa
1472-684X-12-23.pdf (319.9Kb)
Lataukset: 

doi:10.1186/1472-684X-12-23
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042714283
Tiivistelmä


Background



Hypoventilation due to respiratory muscle atrophy is the most common cause of death as a result of amyotrophic lateral sclerosis (ALS). Patients aged over 65 years and presenting bulbar symptoms are likely to have a poorer prognosis. The aim of the study was to assess the possible impact of age and treatment with non-invasive ventilation (NIV) on survival in ALS. Based on evidence from earlier studies, it was hypothesized that NIV increases rates of survival regardless of age.



Methods



Eighty-four patients diagnosed with ALS were followed up on from January 2001 to June 2012. These patients were retrospectively divided into two groups according to their age at the time of diagnosis: Group 1 comprised patients aged ≤ 65 years while Group 2 comprised those aged > 65 years. Each group included 42 patients. NIV was tolerated by 23 patients in Group 1 and 18 patients in Group 2. Survival was measured in months from the date of diagnosis.



Results



The median age in Group 1 was 59 years (range 49 – 65) and 76 years in Group 2 (range 66 – 85). Among patients in Group 1 there was no difference in probability of survival between the NIV users and non-users (Hazard Ratio = 0.88, 95% CI 0.44 – 1.77, p = 0.7). NIV users in Group 2 survived longer than those following conventional treatment (Hazard Ratio = 0.25, CI 95% 0.11 – 0.55, p <0.001). ALS patients in Group 2 who did not use NIV had a 4-fold higher risk for death compared with NIV users.



Conclusions



This retrospective study found that NIV use was associated with improved survival outcomes in ALS patients older than 65 years. Further studies in larger patient populations are warranted to determine which factors modify survival outcomes in ALS.




 

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